...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Science in China, Series B. Chemistry >Hydroisomerization of n-heptane over bimetal-bearing H3PW12O40 catalysts supported on dealuminated USY zeolite
【24h】

Hydroisomerization of n-heptane over bimetal-bearing H3PW12O40 catalysts supported on dealuminated USY zeolite

机译：在脱铝USY沸石上负载的含双金属的H3PW12O40催化剂上正庚烷的加氢异构化

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The bimetal-bearing (CePt or LaPt) 12-tungstophosphoric acid (H3PW12O40 (PW)) catalysts supported on dealuminated USY zeolite (DUSY) were prepared by impregnation and characterized by XRD,BET,IR,and H2-chemisorption.Their catalytic activities were tested in the hydroisomerization of n-heptane with a continuous atmospheric fixed-bed reactor.After the steam treatment combined with the acid leaching,as well as the supporting with PW and the bimetals,the DUSY support retains the Y zeolite porosity and the PW well keeps its Keggin structure in catalysts.The doping of Ce into the catalysts enhances the dispersion of Pt on the catalyst surface.The Pt-bearing PW catalysts doped with Ce or La,especially Ce,exhibit much higher catalytic activity and selectivity than the catalysts without dopants at lowered reaction temperatures.At the optimal reaction conditions,i.e.,the reaction temperature of 250°C and WHSV of 1.4 h~(-1),the catalyst with a Pt loading of 0.4%,PW loading of 10% and a molar ratio of Ce to Pt of 15:1 shows a conversion of n-heptane of 70.3% with a high selectivity for isomerization products of 94.1%.
机译：通过浸渍法制备了负载在脱铝USY沸石（DUSY）上的双金属（CePt或LaPt）12钨磷酸（H3PW12O40（PW））催化剂，并通过XRD，BET，IR和H2化学吸附对其进行了表征。在连续大气固定床反应器的正庚烷加氢异构化中进行了测试。蒸汽处理与酸浸结合以及PW和双金属的载体结合后，DUSY载体保留了Y沸石的孔隙率和PW井在催化剂中保持其Keggin结构。将Ce掺杂到催化剂中可增强Pt在催化剂表面的分散性。掺有Ce或La的含Pt PW催化剂，特别是Ce的催化活性和选择性要比不含Ce的催化剂高得多在最佳反应条件下，即反应温度为250°C，WHSV为1.4 h〜（-1），催化剂的Pt负载量为0.4％，PW负载量为10％，摩尔比为比例Ce与Pt的比为15：1时，正庚烷的转化率为70.3％，异构化产物的选择性为94.1％。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号